Mark fieldset-mask as failing on XP.

BUG=506525
NOTRY=true
TBR=chrishtr

Review URL: https://codereview.chromium.org/1222143002

git-svn-id: svn://svn.chromium.org/blink/trunk@198205 bbb929c8-8fbe-4397-9dbb-9b2b20218538
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 065d982..636e019 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -1035,6 +1035,8 @@
 crbug.com/374936 [ Linux Win Debug ] svg/dynamic-updates/SVGImageElement-dom-height-attr.html [ ImageOnlyFailure Pass ]
 crbug.com/374936 [ Linux Win Debug ] svg/dynamic-updates/SVGImageElement-dom-width-attr.html [ ImageOnlyFailure Pass ]
 
+crbug.com/506525 [ XP ] paint/masks/fieldset-mask.html [ ImageOnlyFailure ]
+
 crbug.com/375565 [ Mac ] fast/repaint/caret-with-transformation.html [ Pass Failure ]
 
 crbug.com/375567 web-animations-api/w3c/simple-keyframes.html [ Pass Failure ]